Protected optical disc

Details Protected optical disc Protected optical disc

1979-09-25

1981-12-29

Hartary, Joseph W.

Recorders

Record receivers and/or driving means therefor

Laminated, impregnated, or coated bases

346137, 430945, 430961, G01D 1534

Patent

active

043085458

ABSTRACT:
This disc has a layer of an inscribable and optically legible recording material deposited on a transparent plate traversed by the recording or reading beam and protected from the outside by a cover formed for example by a metal sheet, whose two surfaces are fixed to the layer so as to form a space in front of the latter.

REFERENCES:
patent: 4001840 (1977-01-01), Becker
patent: 4038663 (1977-07-01), Day
patent: 4074282 (1978-02-01), Balas
patent: 4264911 (1981-04-01), Wilkinson

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